Xerox Phaser 4 400 Manuel d'entretien - Page 6

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Electrostatic Discharge (ESD) Precautions

Some semiconductor components, and the respective sub-assemblies that contain

them, are vulnerable to damage by Electrostatic discharge (ESD). These components

include Integrated Circuits (ICs), Large-Scale Integrated circuits (LSIs), field-effect

transistors and other semiconductor chip components. The following techniques will

reduce the occurrence of component damage caused by static electricity.

Caution: Be sure the power is off to the chassis or circuit board, and

observe all other safety precautions.

Immediately before handling any semiconductor components assemblies,

drain the electrostatic charge from your body. This can be accomplished by

touching an earth ground source or by wearing a wrist strap device

connected to an earth ground source. Wearing a wrist strap will also prevent

accumulation of additional bodily static charges. (Be sure to remove the

wrist strap before applying power to the unit under test to avoid potential

shock.)

After removing a static sensitive assembly from its anti-static bag, place it

on a grounded conductive surface. If the anti-static bag is conductive, you

may ground the bag and use it as a conductive surface.

Do not use freon-propelled chemicals. These can generate electrical charges

sufficient to damage some devices.

Do not remove a replacement component or electrical sub-assembly from its

protective package until you are ready to install it.

Immediately before removing the protective material from the leads of a

replacement device, touch the protective material to the chassis or circuit

assembly into which the device will be installed.

Minimize body motions when handling unpackaged replacement devices.

Motion such as your clothes brushing together, or lifting a foot from a

carpeted floor can generate enough static electricity to damage an

electro-statically sensitive device

Handle ICs and EPROM's carefully to avoid bending pins.

Pay attention to the direction of parts when mounting or inserting them on

Printed Circuit Boards (PCB's).

Phaser 4400 Laser Printer Service Manual